<!DOCTYPE html>
<html lang='en'>

<head>
    <meta charset='UTF-8' />
    <meta name='viewport' content='width=device-width, initial-scale=1.0' />
    <title>Document</title>
    <script src='../js/vue.js'></script>
</head>

<body>

    <div id='root'>
        姓：<input type="text" v-model="firstName" />
        <br>
        名：<input type="text" v-model="lastName" />
        <br>
        全名：<span>{{fullName}}</span>
        <br>

    </div>
    <script>
        const vm = new Vue({
            el: '#root',
            data: {
                firstName: "张",
                lastName: "三"
            }, computed: {
                /*fullName: {
                    get() {
                        console.log('get被调用');
                        // 此处的this是vm
                        return this.firstName + ' ' + this.lastName;
                    },


                    set(value) {
                        console.log('set', value);
                        const arr = value.split(' ');
                        this.firstName = arr[0];
                        this.lastName = arr[1];
                    },
                },*/
                fullName() {
                    console.log('get被调用');
                    return this.firstName + ' ' + this.lastName;
                },
            },
        });
    </script>
</body>

</html>